In this schematic the "Screw Wash M4x12" is used most often.
The Cap,seal is the cheapest item from this partsfiche.
Parts such as the Radiator (toyo): O-ring,drain, Fan Assy,cooling, Motor,cooling Fan, Clip,harness are included in the Civic 1993 (p) 2dr Dx (ka,kl) Radiator (toyo) parts fiche.